#284E65
Closest named color: Dark Grey Blue (#29465B). oklch(40.6% 0.058 237.1), rgb(40, 78, 101).
Aa
White text reads best on this color (8.86:1).
About this color
#284E65 is a dark, muted blue. In OKLCH its lightness is 41%, its chroma 0.058 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.027 away. White text reads best on it, at 8.86:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.36:1 |
| White text | 8.86:1 |
Values
| HEX | #284E65 |
| RGB | rgb(40, 78, 101) |
| HSL | hsl(203, 43%, 28%) |
| OKLCH | oklch(40.6% 0.058 237.1) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #284E65 | 8.86:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #284E65 | 2.36:1 | Fails | Lc 13.8 | Not readable |
| #284E65 text on white | 8.86:1 | AAA | Lc 90.2 | Preferred for body text |
| #284E65 text on black | 2.36:1 | Fails | Lc -12.1 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 800.
-
Step 50
50
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E4EBF0
oklch(93.6% 0.01 238.5)
-
Step 200
200
#CEDBE4
oklch(88.4% 0.019 237.8)
-
Step 300
300
#ADC4D4
oklch(80.8% 0.034 238.3)
-
Step 400
400
#81A6BF
oklch(70.7% 0.055 238.1)
-
Step 500
500
#6090AF
oklch(63.1% 0.07 237.7)
-
Step 600
600
#457A9A
oklch(55.6% 0.075 236.8)
-
Step 700
700
#366784
oklch(49.2% 0.071 236.6)
-
Step 800
800 (this color)
#284E65
oklch(40.6% 0.058 237.1)
-
Step 900
900
#294557
oklch(37.6% 0.046 237.9)
-
Step 950
950
#192933
oklch(27.1% 0.028 236.7)
#284E65 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #434E66 | 0.034 |
| Deuteranopia (no green cones) | #3B4765 | 0.030 |
| Tritanopia (no blue cones) | #005456 | 0.044 |
| Achromatopsia (no color) | #4A4A4A | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #284E65
#284E65
oklch(40.6% 0.058 237.1)
- #614129
#614129
oklch(40.6% 0.058 57.1)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #284E65, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.027
- Charcoal #264653 ΔE 0.036
- Dark Slate Gray #2F4F4F ΔE 0.039
- Deep Teal #00555A ΔE 0.040
- Deep Sea Blue #015482 ΔE 0.050
- Dark Teal #014D4E ΔE 0.050
- Light Navy #155084 ΔE 0.052
- Petrol #005F6A ΔE 0.053
Use #284E65 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.